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What is the relationship between pressure and flow?

Published in Fluid Dynamics 1 min read

Flow is directly proportional to pressure, meaning a higher pressure difference drives a greater flow rate through a system.

In a system where fluid moves from one point to another, a pressure difference (or pressure gradient) is required between the inlet and outlet. The relationship between pressure and flow can be summarized as follows:

  • Pressure Gradient: Fluid movement requires a pressure difference. The fluid will flow from an area of higher pressure to an area of lower pressure.
  • Direct Proportionality: According to the reference provided, within the system, "flow is directly proportional to the pressure." (27-Feb-2023). This means if you double the pressure difference, you double the flow rate, assuming other factors remain constant.
  • Higher Pressure, Higher Flow: As the pressure difference increases, the flow rate also increases. Conversely, if the pressure difference decreases, the flow rate decreases.

Essentially, pressure acts as the driving force for flow. Without a pressure difference, there is no flow. The magnitude of this pressure difference directly influences how much flow you will get.